A tunnel knife for cardiothoracic surgery

Abstract

This utility model belongs to the field of medical device technology and discloses a tunneling knife for cardiothoracic surgery. It includes a knife body and blade tips and a handle respectively disposed at both ends of the knife body, with the blade tips being conical or bullet-shaped. This utility model has a simple structure, is easy to operate, can precisely control the size and shape of the incision, and results in a small surgical wound, making it highly practical. This utility model also includes a tunnel tube sleeved on the knife body. The tunnel tube sleeved on the knife body allows the tunnel tube to be inserted into the puncture tunnel during the puncture process. After the puncture is completed, there is no need to insert the tunnel tube separately after the puncture, which greatly improves surgical efficiency.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a tunnel knife for cardiothoracic surgery. Background Technology

[0002] During VAD implantation surgery, a subcutaneous tunnel is typically created to pass the VAD's pump cable through the tunnel and connect it to external controllers and power supplies. Creating a subcutaneous tunnel provides a stable path for the cable, preventing displacement or dislodgement due to patient movement or external traction; it also distributes pressure at the cable-skin contact points, preventing skin damage from prolonged friction or traction; and it prevents the cable from directly exiting the skin through the incision, avoiding incision infection caused by bacterial invasion.

[0003] While subcutaneous tunneling offers numerous advantages, the lack of a tunneling scalpel specifically designed for VAD implantation surgery in clinical practice limits further improvements in surgical outcomes. Traditional scalpels often struggle to precisely control the size and shape of the incision during subcutaneous tunneling, resulting in larger surgical wounds. This not only increases patient trauma and pain but may also lead to postoperative complications such as tunnel site infection, ultimately affecting the overall success rate of the surgery and the patient's recovery process. Utility Model Content

[0004] The purpose of this invention is to provide a tunnel knife for cardiothoracic surgery. It has a simple structure, is easy to operate, can accurately control the size and shape of the incision, and has a small surgical wound. It is highly practical and greatly improves the success rate of surgery.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A tunnel knife for cardiothoracic surgery includes a blade body and a blade head and a handle respectively disposed at both ends of the blade body, wherein the blade head is conical.

[0007] Furthermore, the cutter head and the cutter body are connected by threads.

[0008] Furthermore, it also includes a tunnel tube fitted onto the blade body.

[0009] Furthermore, the cutter body includes a connecting rod and an annular support column fixedly sleeved on the connecting rod, and the number of annular support columns is one or more.

[0010] Furthermore, the diameter of the connecting rod is 1 / 3 to 1 / 2 of the inner diameter of the tunnel pipe; the annular support column is fitted with the tunnel pipe in a transitional manner.

[0011] Furthermore, the blade includes a puncture part and an embedding part; wherein, the puncture part is conical or bullet-shaped, the smaller end of the blade is away from the tunnel tube, the larger end of the puncture part abuts against the tunnel tube, and the diameter of the larger end is equal to the outer diameter of the tunnel tube; the embedding part is embedded inside the tunnel tube.

[0012] Furthermore, the handle includes a limiting part and a gripping part, the limiting part being fixed to one end of the gripping part near the tunnel tube, and the tunnel tube abutting against the limiting part.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The present invention designs the blade head as a cone shape, which can reduce the resistance during the piercing process. The cone-shaped tip of the blade head can penetrate the tissue more smoothly and complete the piercing action faster, thereby shortening the operation time and reducing the surgical risk. It can also more accurately locate the position of the tunnel hole and precisely control the size and shape of the hole, reducing the risk of accidentally damaging the surrounding healthy tissue.

[0015] 2. The tunnel tube on the blade of this utility model can be inserted into the puncture tunnel during the puncture, and there is no need to insert the tunnel tube separately after the puncture is completed, which can greatly improve the efficiency of the operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model.

[0018] Figure 2 This is an exploded view of the structure of Embodiment 1 of this utility model.

[0019] Figure 3 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model.

[0020] Figure 4 This is an exploded view of the structure of Embodiment 2 of this utility model.

[0021] In the diagram: 1. Cutter body; 2. Cutter head; 3. Handle; 4. External thread; 5. Threaded hole; 6. Tunnel tube; 7. Connecting stud; 8. Connecting part; 9. Stud hole;

[0022] 101. Connecting rod; 102. Circular support column;

[0023] 201. Puncture site; 202. Embedding site;

[0024] 301. Limiting part; 302. Gripping part. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Example 1

[0027] like Figure 1 and Figure 2 As shown, a tunnel knife for cardiothoracic surgery includes a knife body 1 and a blade head 2 and a handle 3 respectively disposed at both ends of the knife body 1, wherein the blade head 2 is conical or bullet-shaped.

[0028] This invention relates to a tunneling knife used to create a subcutaneous tunnel during the implantation of a cardiac assist device (CAD). This tunnel allows for the placement of a tube within the tunnel, which then houses the CAD cable, connecting the CAD device to an external power source or control unit. The design of the blade head 2 as a conical or bullet-shaped tip reduces resistance during puncture. The conical or bullet-shaped tip of the blade head 2 allows for smoother tissue penetration, enabling faster puncture and shortening surgical time and reducing surgical risks. It also allows for more accurate positioning of the tunnel hole and precise control of the hole's size and shape, minimizing the risk of injury to surrounding healthy tissue. In this embodiment, the blade head 2 is preferably bullet-shaped, with one sharp end gradually increasing in diameter. During use, the medical personnel hold the handle 3, align the blade head 2 with the desired puncture site, and press down directly to perform the puncture.

[0029] In this embodiment, the cutter head 2 and the cutter body 1 can be integrally formed, or they can be detachably connected. When the cutter head 2 and the cutter body 1 are detachably connected, they can be connected by threads to allow for the replacement of the cutter head 2.

[0030] To facilitate processing and replacement of the cutting head 2, this embodiment preferably uses a detachable connection between the cutting head 2 and the cutting body 1. The end of the cutting body 1 that mates with the cutting head 2 is provided with a connecting stud 7. The cutting head 2 is provided with a connecting part 8, and the connecting part 8 is provided with a stud hole 9 that mates with the connecting stud 7. In this embodiment, the connecting part 8 and the cutting body 1 are both cylindrical bodies with the same diameter as the cone bottom of the cutting head 2.

[0031] In this embodiment, the main steps of the cardiac implantation surgery procedure are as follows:

[0032] Step one: Perform open-chest surgery on the patient;

[0033] Step two: The heart assist device is implanted into the body through a large open-chest incision;

[0034] Step 3: Subcutaneous perforation is performed using the tunnel cutter of this utility model, and a tube is inserted inside the tunnel after perforation;

[0035] Step four: Pass the heart assist device cable through the tube; once the cable is in place and the tube is no longer needed, remove it.

[0036] In step four above, once the cable is in place, the conduit is no longer needed. Retaining the conduit could lead to cable displacement or damage due to movement or friction, and might also hinder the healing of surrounding tissues or affect local blood supply. Removing the conduit allows the surrounding tissue to heal naturally, fixing the cable's position and reducing the risks associated with movement.

[0037] Example 2

[0038] The main difference between this embodiment and Example 1 is that a tunnel tube 6 is provided outside the cutter body 1 in this embodiment, and the specific structures of the cutter body 1 and the cutter head 2 are different. The specific solution of this embodiment is as follows.

[0039] like Figure 3 and Figure 4 As shown, a tunneling knife for cardiothoracic surgery includes a knife body 1 and a blade head 2 and a handle 3 respectively disposed at both ends of the knife body 1, wherein the blade head 2 is conical or bullet-shaped. The blade head 2 and the knife body 1 are detachably connected. The end of the knife body 1 that mates with the blade head 2 is provided with an external thread 4, and the blade head 2 has a threaded hole 5 that mates with the external thread 4; it also includes a tunnel tube 6 sleeved on the knife body 1. In this embodiment, the blade head 2 is preferably bullet-shaped, that is, one end is sharp, and then the diameter gradually increases.

[0040] In this embodiment, the tunnel tube 6 sleeved on the blade body 1 allows the tunnel tube 6 to be inserted into the puncture tunnel during the puncture process. After the puncture is completed, the blade head 2 is separated from the blade body 1, and then both the blade head 2 and the blade body 1 are removed, leaving the tunnel tube 6 in the tissue as a conduit for cable placement. Using this device eliminates the need to separately insert the tunnel tube 6 after puncture, significantly improving surgical efficiency.

[0041] Based on the device of this embodiment, the main steps of the cardiac implantation surgery procedure during actual operation are as follows:

[0042] Step one: Perform open-chest surgery on the patient;

[0043] Step two: The heart assist device is implanted into the body through a large open-chest incision;

[0044] Step 3: Subcutaneous perforation is performed using the tunnel knife of this utility model. Medical personnel manually rotate and remove the knife head 2 through the large incision in the chest, and pull out the knife body 1 in the opposite direction, leaving only the tunnel tube 6 in the patient's body.

[0045] Step 4: Pass the heart assist device cable through tunnel tube 6; once the cable position is fixed, tunnel tube 6 is no longer needed, and can then be removed.

[0046] In the above steps, steps two and three can be performed simultaneously.

[0047] In this embodiment, the cutter body 1 includes a connecting rod 101 and an annular support column 102 fixedly sleeved on the connecting rod 101. There is one or more annular support columns 102. The connecting rod 101 mainly connects the handle 3 and the cutter body 1, while the annular support column supports the tunnel tube 6, preventing lateral movement of the tunnel tube 6. In this embodiment, there are two annular support columns 102: one located in the middle of the connecting rod 101, and the other located at the end of the connecting rod 101 connected to the cutter head 2.

[0048] In this embodiment, the diameter of the connecting rod 101 is 1 / 3 to 1 / 2 of the inner diameter of the tunnel tube 6. The annular support column 102 transitions into the tunnel tube 6. Preferably, the diameter of the connecting rod 101 is 1 / 2 of the inner diameter of the tunnel tube 6. This method not only ensures support for the tunnel tube 6 but also allows for the formation of structures with different diameters on the cutter body 1, reducing contact between the cutter body 1 and the tunnel tube 6, thereby minimizing friction when the cutter body 1 is withdrawn. Simultaneously, other components can enter the gap between the connecting rod 101 and the tunnel tube 6 to balance the air pressure in different parts of the cutter body 1, facilitating its removal.

[0049] In this embodiment, the cutting head 2 includes a puncture portion 201 and an embedding portion 202; wherein, the puncture portion 201 is conical or bullet-shaped, the smaller end of the cutting head 2 is away from the tunnel tube 6, the larger end of the puncture portion 201 abuts against the tunnel tube 6, and the diameter of the larger end is equal to the outer diameter of the tunnel tube 6; the embedding portion 202 is embedded inside the tunnel tube 6. This structure facilitates the disassembly of the cutting head 2.

[0050] In this embodiment, the handle 3 includes a limiting part 301 and a gripping part 302. The limiting part 301 is fixed to one end of the gripping part 302 near the tunnel tube 6, and the tunnel tube 6 abuts against the limiting part 301. The limiting part 301 has a plate-like structure and is mainly used to limit the tunnel tube 6.

[0051] When assembling the structure of this embodiment, first insert the end of the cutter body 1 with the external thread 4 into the tunnel tube 6 until the external thread 4 extends out of the tunnel tube 6. Then, insert the external thread 4 into the threaded hole 5 on the cutter head 2 and tighten it until the conical bottom of the cutter head 2 contacts the tunnel tube 6.

[0052] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific implementation method of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the scope of the spirit of this utility model should be included within the protection scope of this utility model.

Claims

1. A tunneling knife for cardiothoracic surgery, characterized in that, It includes a blade body (1) and a blade head (2) and a handle (3) respectively disposed at both ends of the blade body (1), and the blade head (2) is conical or bullet-shaped; It also includes a tunnel tube (6) fitted onto the cutter body (1); The blade (2) includes a puncture part (201) and an embedding part (202); wherein, the puncture part (201) is conical or bullet-shaped, the smaller end of the blade (2) is away from the tunnel tube (6), the larger end is in contact with the tunnel tube (6), and the end diameter of the larger end is equal to the outer diameter of the tunnel tube (6); the embedding part (202) is embedded inside the tunnel tube (6).

2. The tunneling knife for cardiothoracic surgery according to claim 1, characterized in that, The cutter head (2) and the cutter body (1) are connected by threads.

3. The tunneling knife for cardiothoracic surgery according to claim 1 or 2, characterized in that, The blade body (1) includes a connecting rod (101) and an annular support column (102) fixedly sleeved on the connecting rod (101), and the number of annular support columns (102) is more than one.

4. The tunneling knife for cardiothoracic surgery according to claim 3, characterized in that, The diameter of the connecting rod (101) is 1 / 3 to 1 / 2 of the inner diameter of the tunnel pipe (6); the annular support column (102) is fitted with the tunnel pipe (6).

5. The tunneling knife for cardiothoracic surgery according to claim 1, 2, or 4, characterized in that, The handle (3) includes a limiting part (301) and a gripping part (302). The limiting part (301) is fixed to one end of the gripping part (302) near the tunnel tube (6), and the tunnel tube (6) abuts against the limiting part (301).

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